Magnetic bearing device

Details Magnetic bearing device Magnetic bearing device

1995-07-11

1998-06-02

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 709

Patent

active

057605106

ABSTRACT:
A magnetic bearing device comprises a rotor, electromagnets, radial direction displacement sensors, and a control circuit for controlling an exciting current of the electromagnets in accordance with a signal from the radial direction displacement sensors to magnetically levitate the rotor. The control circuit comprises a position detecting circuit, a calculator, a PID operating part, a phase inverter and power amplifiers. A CPU analyzes the displacement of the rotor at the time of rotation on the basis of a sensor signal issued from the position detecting circuit to supply a correction signal obtained as a result of analysis to the calculator. A magnetic force is thus generated which offsets the oscillation of the rotor for each of the frequency components and is supplied to the electromagnets. The magnetic bearing device is capable of inhibiting displacement components of the rotor other than a first order component in the rotation frequency of the rotor.

REFERENCES:
patent: 4626754 (1986-12-01), Habermann et al.
patent: 4992714 (1991-02-01), Matsushita et al.
patent: 4999534 (1991-03-01), Andrianos
patent: 5013987 (1991-05-01), Wakui
patent: 5130589 (1992-07-01), Kanemitsu
patent: 5202824 (1993-04-01), Chen
patent: 5247219 (1993-09-01), Nakagawa et al.

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